Controlled Blood Flow Training (BFR)— commonly referred to as BFR training and sometimes called occlusion training —involves placing a specialized pneumatic cuff around the upper portion of the arm or leg during exercise. The cuff safely limits venous return while maintaining partial arterial inflow, creating a controlled environment of reduced oxygen availability within the muscle.

This unique physiological state allows individuals to achieve muscle strength, size, and endurance gains typically associated with heavy-load training—but while performing low-intensity exercise that’s joint-friendly and ideal for rehabilitation or deload phases .

To ensure both safety and efficacy, the pressure applied should be personalized to each individual’s Limb Occlusion Pressure (LOP)—the minimum pressure required to fully occlude arterial flow in the limb.  We refer to this evidence-based approach as Controlled Blood Flow Training (BFR).

Typical target pressures are:

• Upper extremity: 40–50% of individual LOP
• Lower extremity: 60–80% of individual LOP

The Delfi BFR Pro system uses patented and proprietary technologies to automatically determine LOP and autoregulate, ensuring precise, repeatable, and individualized pressure control for every limb, every session.

If you want to dive deeper into BFR, you can find some of the key papers on our Research & Literature Page or a more thorough explanation on the page  About Controlled Blood Flow Training.

Yes. When performed with appropriate equipment, personalized pressures, and trained supervision, Controlled Blood Flow Training (BFR) has been shown to be as safe as—or safer than—traditional high-load resistance exercise.

Across thousands of participants studied in peer-reviewed clinical and performance research, the incidence of adverse events with BFR is extremely low, comparable to that of other standard exercise interventions. Reported side effects are generally mild and transient—such as temporary skin redness, mild discomfort, or lightheadedness—and resolve quickly with cuff deflation.

The Delfi BFR Pro system (previously known as the Delfi Personalized Tourniquet System, PTS), used in hospitals, rehabilitation centers, and research settings worldwide, has been featured in over 145 published studies demonstrating its excellent safety, accuracy, and pressure control.

The papers on our Research & Literature page provide a comprehensive safety profile of Controlled Blood Flow Training (BFR) as observed in the literature.

Additional topics and resources that relate to the safety discussion:

VTE/DVT; Venous Thromboembolism/Deep Vein Thrombosis

Podcast with the folks who wrote the Clinical Practice Guidelines

Blog from ORS, Owens Recovery Science, on Controlled Blood Flow Training, BFR, and VTE

Hemodynamics

Podcast with Jamie Burr, PhD from ORS

Blog on hemodynamics from ORS

Yes. Controlled Blood Flow Training, also commonly referred to as Blood Flow Restriction (BFR) training, is one of the most extensively researched rehabilitation interventions in recent decades.
Hundreds of peer-reviewed studies have examined its physiological mechanisms, safety profile, and clinical effectiveness across diverse populations and applications—from post-operative and orthopedic recovery to neurologic and geriatric rehabilitation, cardiovascular conditioning, and athletic performance enhancement.

Within this broad body of literature, the Delfi BFR Pro (Delfi Personalized Tourniquet System) has been used and validated in over 145 peer-reviewed publications, establishing its accuracy, reproducibility, and safety as the clinical standard for personalized BFR.

This research spans:

• Mechanistic studies exploring muscle physiology, cellular signaling, and endocrine responses
• Safety and hemodynamic investigations confirming tolerance in both healthy and clinical populations
• Clinical trials and meta-analyses demonstrating improved strength, hypertrophy, and functional recovery
• Orthopedic, neurological , and geriatric applications , including post-surgical , chronic pain, and mobility-limited populations
• Performance and return-to-play studies in elite and tactical athletes

Almost any patient that is cleared to participate in exercise but can’t perform exercise at a high enough intensity to cause adaptation could benefit from Controlled Blood Flow Training. Nothing about BFR is diagnosis-specific. Common applications include:

Post-Surgical Rehabilitation:

• ACL reconstruction
• Meniscus repair
• Rotator cuff repair
• Total joint replacement
• Achilles tendon repair

Injury Management:

• Muscle strains
• Tendinopathies
• Stress fractures (during non-weight bearing phases)
• Chronic pain conditions

Special Populations:

• Elderly individuals with sarcopenia
• Osteoarthritis patients
• Cardiac rehabilitation (with appropriate screening)
• Neurological conditions (MS, stroke, Parkinson’s)
• Athletes during in-season load management

For specific examples and protocols, see Owens Recovery Science (ORS) blogs on:

• Managing ACLs with PBFR
• Managing Muscle Strains
• BFR for the Older Individual

Controlled Blood Flow Training, BFR, can be used as a strategy to make exercises stressful enough to induce an adaptive response. Almost any patient who is cleared to participate in exercise but can’t perform it at a high enough intensity to cause adaptation could benefit from Blood Flow Restriction Training.

Key Clinical Advantages:

• Achieve muscle hypertrophy with loads as low as 20-30% of 1RM
• Reduce joint stress and compression forces
• Start resistance training earlier post-surgery (as early as day one post-op)
• Maintain muscle mass during immobilization or restricted weight-bearing
• Add training volume without excessive mechanical load
• Reduce pain during rehabilitation
• Accelerate return to function timeline

If you want to dive deeper or see examples of how BFR has been used, see blogs and podcasts from Owens Recovery Science:

Blogs:

• BFR After Anterior Cruciate Ligament Reconstruction
  • Managing ACLs with PBFR
  • More than Just Muscle
• Managing Muscle Strains
• BFR for the Older Individual
• BFR and Pain

Podcasts:

• Heart Failure and BFR?
• The Chanda Plan Podcast
• BFR in Persons with Multiple Sclerosis with Mark Mañago, PT, DPT, PhD, NCS
• BFR in Neuro Rehab with Nicole Walter, PT

For complete details on the contraindications and precautions, please refer to the Information for Use ( IFU) available at delfimedical.com/ifu

No, taking a course is not a requirement, but it is the recommended best practice. A BFR course will give you the most up-to-date information on how to apply BFR to meet your population. The course also walks through the safety considerations of BFR and how to determine who is appropriate.

If you feel like you already have all of the information you need to use BFR in your practice and you fall into one of the approved categories for purchase, then you can purchase the device without attending a course.

We strongly recommend taking a course if:

• You are new to  Controlled Blood Flow Training (BFR)
• You want to ensure optimal patient outcomes
• You want hands-on training with the equipment

To find a certified educator, please contact Owens Recovery Science or our distributors if you are outside the USA.

If you can’t find a distributor in your region, send us an inquiry, and we’ll happily assist you in finding the right certification course to start your career as a Controlled Blood Flow Training Professional.

40 Years of Tourniquet Technology: Delfi has been making devices to Control Blood Flow into limbs for forty years. We modernized surgical tourniquet systems with the invention of the microprocessor in 1980, dramatically improving accuracy and decreasing risk. Prior to that, tourniquet systems were more likely to cause nerve injuries due to excessive pressure. All tourniquet systems used in surgical suites today are based on the Delfi microprocessor design.

Only Patented LOP Technology: Delfi holds the only patent on Limb Occlusion Pressure (LOP) measurement technology. Despite the BFR industry being nearly a decade old, this remains the gold standard for personalized pressure application.

Independent Research Validation: The Delfi BFR Pro system has independent research validation showing that it does what it claims to do:

• LOP Assessment Accuracy
• Consistent Pressure During Exercise
• Over 90 peer-reviewed publications using the Delfi system; see some of them on our Research & Literature page.

Surgical-Grade Patented Autoregulation: Research shows the Delfi system maintains target pressure within ±15 mmHg during dynamic exercise, even with muscle contractions. This level of accuracy and responsiveness is unmatched in the BFR market.

No Recurring Costs: Unlike some competitors, there are no subscription fees or ongoing costs beyond the initial device purchase and replacement cuffs as needed.

Clinical and Research Acceptance: Used in major research institutions, military rehabilitation centers, and professional sports organizations worldwide.

It’s really up to you as the clinician to decide what you feel is necessary to apply BFR clinically and how objective that application needs to be. We typically recommend that whatever device you choose to use, be able to defend why you chose it.

The Delfi BFR Pro systems are intended to be used by a physician or a physician’s designated licensed healthcare practitioner, including but not limited to physiotherapists, surgeons, physiotherapy clinics, and sports teams with resident physiotherapists/athletic trainers/physicians/strength coaches.

These systems are designed for clinical and professional environments where individualized pressure control and patient safety are required.

• Dual-channel system: Train both limbs simultaneously with independent pressure regulation, LOP measurement, and advanced bilateral protocols, including alternating and IPC modes. Supports wireless EMG integration for real-time muscle activation feedback, enhancing precision and training documentation.
• Single-channel system: A compact, portable solution designed for single-limb training, ideal for targeted rehab or simplified workflows.

Both systems deliver clinically validated, personalized Blood Flow Restriction (BFR) training.

Limb Occlusion Pressure (LOP) is the minimum pressure required to restrict blood flow in a limb during Blood Flow Restriction training.

Using the correct LOP is critical because it:

• Ensures personalized pressure for each individual
• Improves safety by reducing the risk of over- or under-occlusion
• Improves consistency and clinical outcomes

Both systems use patented automatic LOP technology to determine this value quickly and accurately—eliminating guesswork and optimizing outcomes.

Pressure autoregulation continuously monitors and adjusts cuff pressure in real time during training.

This is critical because:

• Limb movement and muscle contractions alter the applied pressure.
• Without adjustment, the target pressure is not maintained.
• Consistent pressure is required for a predictable physiological response.

Delfi’s proprietary autoregulation ensures precise, uninterrupted pressure delivery throughout the session.

• Dual-channel system: Advanced pre-programmed and customizable protocols, including bilateral, alternating, and IPC modes
• Single-channel system: 12 fully customizable protocols, adjustable for timing, pressure, repetitions, and cycles

Both systems support rehabilitation, performance training, and return-to-play applications.

Yes. Both systems include:

• Real-time calibrated pressure display
• Pressure application timer
• Session tracking/history

The dual-channel system adds:

• Repetition guidance
• Optional EMG integration for enhanced feedback and training precision.

Yes. Both systems include session history, allowing you to monitor performance, track progress, and adjust protocols.

Both systems are designed with built-in safety and reliability to ensure consistent, accurate operation every session. Key features include:

• Automatic self-test and calibration at startup
• Continuous system monitoring to detect any performance issues in real time
• Integrated leak detection to ensure optimal cuff and system function
• Safe maximum pressure and time limits to prevent overexposure
• Automatic LOP-based personalization for individualized, safe pressure
• Reperfusion timer to allow proper blood flow recovery between cuff inflations, reducing the risk of tissue damage
• These features work together to provide safe, reliable, and clinically effective BFR training for every user.
• Integrated leak testing
• Quick-Connect/Release Cuff connectors allow the system to disconnect instantly, enabling the cuff to deflate quickly in emergency situations

This ensures consistent, accurate operation every session.

Delfi Contour Cuffs are patented, medical-grade, anatomically shaped tourniquet cuffs designed to match the natural taper of limbs for a snug fit on both proximal and distal edges. Their contoured design:

• Provides a secure, comfortable, anatomically accurate fit
• Distributes pressure evenly, reducing the required occlusion pressure
• Enhances overall safety and comfort during BFR training

These features make them superior to traditional straight cuffs, supporting safer, effective, and more comfortable sessions.

Yes. Both systems are:

• FDA-listed Class I medical devices, EU Class I registered medical devices, and Health Canada Class II registered medical devices
• Certified to IEC 60601 standards
• Manufactured under ISO 13485 quality systems

• Dual-channel system: Up to 24 hours with dual Lithium-ion batteries and quick-swap capability
• Single-channel system: Up to 10 hours of reliable operation on a rechargeable Lithium-ion battery

Yes. Both systems are designed for easy mobility and convenient travel.

The systems are lightweight and travel-ready (see weights below). If you plan to bring them on an airplane, please check with your airline for guidance on devices containing lithium-ion batteries.

BFR Pro Gen3 Dual Channel: 2.25 kg

BFR Pro Single Channel: 1.263 kg

Proper care helps ensure safe, reliable, and long-lasting operation of your BFR Pro system and Easi-Fit Cuffs.

For complete instructions and detailed maintenance procedures, please refer to the system’s Instructions for Use (IFU) available at delfimedical.com/ifu

Yes, you can. Send a message with your information as a Service Request here.

Be prepared to include the serial number and a description of any issues you’re experiencing when you reach out.